Emsie,
Hello,  I so appreciate the opportunity to read for you Emsie. 🌸 Thank you so much for your patience.  My guides were sending a reward to you for your patience with me. :♡: My plan was  to read one tarot per question with your final oracle card to tie it together.. they (guides) intervened,  the Sun card spilled out first thing. Now I see this as very hopefull.
Remember while reading the messages, that Sun. ☀️

Your Tarot Cards are from  Tarot of Alchemy 1977 - England

A note just before the shuffle, a tiny little shiny thing on the carpet called for my attention. Thought it might be glass it concerned me, I have furbabes. It was a plastic particle.   I think this maybe 'attention to little things'.

  okay ..
Playing during this reading
song1
Elton John ~ This Is Your Song http://youtu.be/CrznwpD-2tk
I thought I heard 'Sun' inthe lyrics, it may have been Song this song certainly interesting for your read .. WORDS.
Song2 
Foreigner ~ I want to know What Love Is http://youtu.be/r3Pr1_v7hsw

~♡~

I'll be asking w/o total traditional details. You probably know the cards well. ☆
Your Card for your Q : What's gonna be our first bigger problem/issue we're gonna have to solve and overcome together?
is The Devil. I'm not surprised.  Not due to you, the energies relating to this world are bringing that card up often, I read/watch other readers. (learning)
  ~ I asked with my crystal/amethyst and Moonstone heart in my hand. It likely will be someone's dependency/ co dependency but I really felt they were saying 'addiction(s)'. In this time, it could be a simple solution but it possibly could take a lot of energy and harmony away from the pairing. If there's a tie to a chemical, person, place, thing even a memory  ~ it will need determination for both to work together to with full hearts and communication, remove this/these obstacle(s). 7 just fell in my typing error. Does 7 have meaning to you/or both of you?

2nd Q ~  in 3D reality what effort will he make and/or what steps will he take on his behalf to make the this existing issue between us disappear for good?
You recieved 6 of Chalices ~
The keys I think stand out are Children, childhood, nostalgia, yearning, creativity,  immaturity, family, support ..
The Devil could be an attached loved one struggling with the Devil but it effects you as a pair.  Or someone in your union holds onto memories of people or an old place, way of doing something that in our new world - simply isn't the same. Feeling that loss, grief but not completely feeling the deep grief. Because you're  together. That glimmer in the others eye .. the desire and warmth. You together feel as though you can weather any storm ~ as long as you have eachother.
This card, in terms of of health does denote caring for someone ill. I think based upon your first card, it is not of true illness, a symptom that relates to emotion dis-ease. Such as the addiction we spoke of or like gout, which is relating with excessive proteins.

 Your Oracle card is~
(13)  • Voice of An Angel •
=4 which is foundation. 
 A healthy solid balanced foundation.
Funny she's playing guitar. Offering her talent (gift) to
produce what will sustain her with her bird companion in her card. Around her are florals that look holographic,  yet they are her beautiful song coming out out of what seems baren, simple in surroundings.  Except her guitar, seating and this bird. She's found beauty, that brings her music to a life.  No troubles are hindering her melody. The bird 'freely' wishes to stay with her.
They bring each other comfort. Harmony.  Foundation.
I feel  these cards all together say there's 'nothing the devil can do', the Sunshine and you two have divine light shining upon your path ~ together - Don't be afraid.
I'm not too educated on gemstones but  I am being told tigers eye and sunstone might help with courage and bring both Sun+Mars  energies to give you both the strength to weather any storm, addiction or fear.
Look in each others eyes. Listen to even little things said and little clues may lead you to hidden troubles your awareness needs an alert to. I hope this helped.
I wish you both the very best Emsie.  :♡:

Very sad for your dad. Your healing and cutting that cord might jar him to a moment of his triggering. People do go through life just not getting to deeper levels. In this time many unlikely ones do come to terms of their own shadow sides.  It is gruesome work but we all go through it somehow ~ sometime. Unless we don't.  In the end it might be much harder ~ if we didn't. There's a film What Dreams May Come come to mind. It was relating with spouses, however a surprise in the end that although maybe one reunion did not go well, another did. Hope I've not ruined it ~ have you seen it? You might like it. Crossing over themed.

You have done a 180 from your feelings. You're light years ahead of me. You've a badge of courage and wisdom Emsie.
It could be the many people I've known, perhaps created karma, I wish I hadn't. Sometimes, I rememberwhat certain healers have said. They say we have the spiritual contracts, one person does the bad action, the idea is, if you ever heard the term used "Turn the other cheek" .. or "rise above". And yes, some dirty doings are beyond comprehension. I mean terrible things but to think we trade places, I feel bad for myself as well the one who has wronged me. So I pray to heal us both. Not trying to preach (Sag rising .. ha) but that is one way how I view these experiences.

" chosing my battles well and wisely" being clever and consciously strategic. [My intended peace and harmony was also described in your reading by (13) • Voice of An Angel • - totally on point ❤ ]"
  I'm so happy to hear that.

.
I certainly will read that Devil card LL thread. Thank you.
I see it as addictions, chains and bondage to things and people who are not healthy for them.  However our thoughts can create a Devil as well. It can be a tangible or behavior that undermines higher best good.
.

" .. I just can't find the proper words to describe that moment. Later turned out he has almost the exact same color eyes as me. Interestingly enough, mine changes colors according to my mood, mostly it is deep ocean blue. I have central heterochromia in both eyes, I basically have "crowns" around my pupils, and there are rays coming from them and look like sunrays coming from the sky (and below ocean surface.) But sometimes the color tends to turn into a greenish-blue shade, it depends." ..
   Your connection is beautiful.  I love the way you paint it in your writing. I have seen photos of heterochromia. Captivating eyes. Difficult to look away from. 
I am so happy it has helped in some way, it is nice to hear when/if there is resonance.. feeling I can help, gives  me a good feeling too.
 you have much in-depth  knowing within you. So far ahead of the many. I truly hope you will continue the release of all the 'then' and grasp all the 'now and evermore'.

Did I mention your Oracle card being artistic related well with Venus, rose quartz would be a wonderful addition to your world too. Soothing, loving, peace and harmony.  ♡