Unfortunately grief often has an impact on families, even where you thought everything was fine. I found after I lost my dad where I thought my family were close, my uncle started slagging me off to my dads best friend. It was really hurtful. I also found relations with my other uncle became strange, he could like or comment on Facebook but when I was in the area and phoned then popped in for a cuppa it was so awkward, didnt ask how i was, how my sister was and mainly we just talked about his dog.
So, not sure I have much advice for you :-( but you can talk to us here about it. Sending a big hug
xx