As salamualaikum wa rahmatullahi wa barakatuhu 

Alhumdulillah I'm blessed to have a good husband, my question is related to my inlaws. 

1. I dont talk much reason i safeguard my tongue but my inlaws says that shows you are arrogant. They want me to share everything with them but the fact is being married to my cousin nothing is hidden from them except a few personal things that I'm asked not to share. They ask me to open up, and I'm too scared to talk shaytan is everywhere i don't want to hurt them or do backbiting. Am I doing something wrong?
2. We were on vacation for 3 months i don't know what had happened all of sudden few days before leaving my FIL started behaving different, not talking or even looking at me he did the same with me and my kids while leaving though we stay miles and miles away. Until now its the same i even texted him asking to forgive me if i had hurt him but no reply to any of my messages. Earlier his bond was not good with his son  and was too good with me but Alhumdulillah this vacation had got them closer and things got opposite on my end. Do you think i should still be trying to convice him to forgive me for something that i dont know?