Eh, he's probably just slow in that uptake, some guys are. Some reay don't cae and some realy don't know what to do with the opposite sex.
Or he could be...well... you know....
LOL, I'm fucking with you, more than likely being his father, one he probably feels he has to draw away from (especial now that you are oh so spiritually weak and hanging with his wordly brother) that you just don't KNOW who he likes. I mean I dont know the content of your relationship but just beause your his dad doesn't mean he'll automatically open up about all of his love interest. I'm sure its been somebody by now he just might not know what to say or even think to come to you guys in that way. Lord knows the girls I liked I know to keep my family out of my business 'cause all I got was a barrage of "DONT DO IT OMGZ< YOULL GET HER PREGNANT AND YOUR LIFE IZ OVAH AND JEHOVAH WONT LOVE YOU" and he might deal with that internally too.
So just calm down. Some people are just slower than others when it comes to relationships and what not.
EDIt: Forgot to add, still @ home with the wintess fam. Not fun. Leaving in the next six months once me and my friend have our finances in order. Cant wait for my first apartment!!