I have recently split (1 week)with my son's dad.i want their relationship to carry on as normal as possible only thing is he has moved into a flat with a younger girl who he met 2 weeks ago I don't know if they are in a relationship or not but I'm not happy for my 23 month old son to go to his flat at all while she is living there can I stop this as it is way too soon to introduce a total stranger I feel like he is going to go against my wishes on this I don't want to stop contact just my son going to the flat.