I'm currently living with a friend until I can move myself DH and DCs into a house of our own, hopefully at the beginning of next month.
DFriend's gf lives with him and her son from a previous relationship - I don't especially like him as I find him naughty, rude and aggressive sometimes but he is only 3 so I try to be understanding (hey, my dcs aren't perfect!) and I never let on that I don't really like him.
Despite this I was looking forward to seeing how he would get on with Ds1 and 2 as they and DH came to visit me recently and immediately this boy and Ds1 got on really well. Great. However he seemed to take an instant dislike to Ds2 - I am a bit more protective of Ds2 as he is autistic and non verbal.
This boy seemed the make a point out of tormenting Ds2 - he would constantly hit him 'because he (Ds) was being naughty