Died suddenly brain bleed

July 2021 both my mom and sister went together to get their second shot of Pfizer same lot number same vile! 3 days after my mom got what seemed to be full on dementia like turning on a light switch I did take her to several doctors and asked could it be a side effect because my mom was on blood thinners because she has a mechanical heart valve her blood was so thick she went from 3 mls of Warrifern to 10 mls! A month later my sister said she wasn’t getting a 3rd shot because it was effecting her brain she was loosing memory and was angry then 9 months later she died suddenly from a subarachnoid hemorrhage