Egyptians:do u think i should tell my family?

[gigi]

well i have this cousin he has 3eeb khalqy in his legs so he is has less opportinuty in life , my sister is convinved he is retarded but none of us is convinced that he is retarded he is 26 years old and i dont feel he is 26 years old i feel he is much younger than this (i feel he is not a grown up)
and our families alomost have a great relation and i am the one who make these two famillies close with each other i always says to my father to go out with them or visit them . and we all go to masyef with each others and these stuff

so whats the problem

well the problem is
that we use to talk on the net
i told him to open some good subject we can talk about and he said with bega7a ta3ally nikalim fe el sex
and i told him eh 2ilit el 2adam dih and i said bye and then after this he tries to talk to me but not in a regret way and i way like he feels its something normal and that i am over reacting and in istehtar way . i told him fe 7aga isemha adab we akhal2 we terbya
and he said enty ely el ma3endkesh akhla2 we keda i really was surprised because his family is good and i really refused to talk to him and then after few mounths we visit them and i decided to act normally because at the end he is my cousin and then these days he was telling me about how he had a fight with his mother (7aga hayfa) and i told him to go and yesela7ha deh mamto and he said ana ragel we mesh 7arge3 fe kelmty and i told me no keda enta mesh ragel el ragel howa ely yeroo7 yeboos eed mamtoo we yesal7ha we mayz3lhash and then he said ya3ny enty ely benty awy and i told him if u didnt stop this e2lit el 2adab i will tell my family and i swear of that we sa3tha teb2a moshkela ,and then he said roo7y 2o3dy ganb mamtek we et3alemy el 2adab and then i said 3ala 2al ana mesh baz3el mamty we baboos edeha yom lama ye7sel za3el and i said 7aseby Allah we ne3ma el wakeel ...a mounth ago we were talking about me being a police officer ,he dislike them and i told him khalse
i told him in a funny way matgwezsh zabeta and he said howa ana 7agwez ragel zayey i told him 3alfekra deh 2elet zoo2 but welaughed because i dont want to make any problems

so what do u think i should do tell my family about it but i think it will make great problems between the two families i dont want that because my father and my uncle are related and i am a family girl i prefere lamet el family on lamet el as7ab although i have great friends
or
i tell my sister and my brother about that and they yetsarfo or y2at3ooh
or leave it

NT my sister agrees with me he is a provoking guy and he provokes me and my sister but we always nenfaed because his legs is bad and he is mo3aweq so we say we wont nakhod kalamo 3ala gad 3al 2asas nera3y zeroofo

so what do u think