My "FIL" sent me and my friends and family a friend request on Facebook

My husband got adopted at 17 by my in laws. His biological mom died to drug overdose when he was 15. He had been put in foster care at 14 because did dad was doing disgusting things to him and all his son's. My husband was sexually abused by his dad from as young as he can remember and his first memory of it he was 4 but he was molesting his younger brother as a baby so who knows how long it's been going on. His dad recently sent me a friend request on Facebook and texted me "Congrats on the babies!" I had twins. My family and friends were also saying my husband's father sent them friend requests. I of course blocked him. But I'm wondering if it's a good idea to even tell my husband. We have been exhausted lately. We have two week old twins. We are both on leave from work and are getting about 4 hours of sleep each a night. I think this will be too much.