Yeah, I think the fact Aki didn't warn Kanata of any issues would imply things will go all right.
If the parents weren't accepting I'd assume Aki wouldnt have even given the invite to start with(she wouldn't put Kanata in that kind of awkward/scary position) or at least would have given a warning on not revealing that Kanata is a male wearing feminine clothing to the parents.
But with how relaxed Aki is the parents are probably pretty chill. I am expecting a pretty wholesome family meeting.
Plus to meta-story a little, with how Kanata's father seems to be based on that panel flashback, it might be a little too much to have both familys not accepting of the lifestyles. We need at least one family to make things feel warm and fuzzy.