Wouldn't be surprised if father and foreign uncle ends up together. But personally I'd prefer father-san and foreigner-san get close in a platonic way. (Maybe later on foreigner-san would meet a new love interest. If father is straight it'd be interesting to see whether he's able to stay open minded and accept the uncle and his new lover or not.) I think it'd be nice to read that father and Kana can accept the foreign gay uncle into their little family.
It can go either way--maybe he's like his twin and doesn't realize it, suppressed. But yeah, a platonic friendship where Mike manages to break down some prejudices might be nice. Plus ,the most important thing, teaching the brother things about his dead-sibling, from which he got estranged. A sort of emotional reunion.
I think, there is no need for platonic or any other romantic ferlings between them. Why, its so good that they can find acceptance being themselves and not making other type of relationships. Anything more would kind of changed the massage this manga is sending.
Platonic is not romantic. It's a deep friendship I meant by that, which seems to be what they are developing. Not sexual.
Tagame sensei please continue making vanilla manga like this. Always love sansei's drawing and it's interesting reading sensei's take on slice of life/family drama genre. Would love to read a shounen ai manga from Gengoroh Tagame.