Would dating him be to awkward

So I just started talking to this guy. And because I've been lied bad in the past I went into Facebook investigation mode. Well I found out that hes somewhat related to my cousin who I'm close with. But they arent even really related. So my cousins half sister is married to his brother and they are raising their sister. Cousins sister is from his dads previous marriage and we are related thru his mom. Only time I ever see his sister is when she shows up to cousins kids bday partys. And that's it. So I guess what I'm wondering is how awkward do you think it would be if me and him were to eventually get together.