(1) He is 3 years old now and knows our partners a little (we have about 4 ever since he was a little baby as he gets to see them here and there) - he likes them. Last month one of them came with a giant electric lego fire truck and we all had fun playing together. It's not like we have sex in front of him... so our activities and communication is quite normal, social and kids safe when the kid is awake. If he will ever think they are more than just friends, then the only problem would be if he told this to my mom. Kids take this quite normally from what I've seen in polyamory relationships with kids involved (I know about 3 who are open to their kids about this), kids take this quite naturally. It's society who won't take it so lightly so I'm "in the closet" about this when it comes to the child's life. It's not really a topic to have with mothers of kids who are friends with my kid. It's my sexual life and shouldn't interest them or be discussed with my kid. (we are in an open relationship we are not poly)

(2) You mean, if I'm as a female get stalked by someone I dated? Happened to me a few times, but way before I met my husband. Unfortunately, it's a dating risk and exists in the dating world, not unique to open relationships in any way.