I split with my girls dad when they were 5 and 7 I was always honest and answered questions appropriate to their ages,they are now 16 and 14,two years ago I split with my second husband,he cheated,and left our son was 3 now 5,it affected my girls far more as two ‘dads’ had left them,my eldest struggled a lot,but I was always there,we spoke,we were each others rock,my son came out with a lot at school he told his teacher daddy hurt mummy I don’t want him to hurt me,and my daddy doesn’t love me I’m scared he’ll take me away,heartbreaking but I opened up to the teacher told them he’d seen his dad attack me,I had a meeting with family support worker,and they also sent a senco teacher to work with him,gave him chance to talk,I openly talk to him at home,tell him it’s OK not to have a dad,I love him enough for two,it’s hard but we have no idea how they process things so take it one step at a time,tell them you are always there to talk, ask if any things worrying them, wetting can just be a symptom of anxiety hopefully it will stop,good luck x