When you look at someone and they remind you of someone

I spent Easter with my ex older brother, is that my brother in law technically ?? It’s just I never married my ex lol . Well recently he helped me financially for my son/his nephew, and even picked me up to spend Easter with him and his jealous ex gf and our kids. I spoke to my bro in law outside of his car so his ex gf couldn’t hear us . We spoke a little about his brother, my ex who’s in jail and chexked Up on each other . His ex gf is a bit jealous I guess because I was told she think I like him. Which I never looked at my ex brother like that in any way. Iv cried to my ex brother that I loved my ex and I just couldn’t take what he was doing to me . Iv given him bail Money for my ex at one point and his brother has really been there at some hard times . He almost my family… I do look at him at some points in his eyes and he reminds me of my ex and my heart may feel sad and happy , it’s the same feeling I get when I look at my son .. they all look alike lol it’s really beautiful I should say. because I had to grow up and I was adopted and I never looked like someone . This is something I explained to my brother in law. I respect him and he is the closest thing to my ex and an uncle to my son .