I realy need 2 know if its bad 2 like my brother in laws brother?

my sister got with this lad and i like his brother iv been out with his brother b4 and tbh i think i love him is it bad 4 me 2 like him?
Update: i think it because my sister goes out with him brother. should i still go 4 it even tho half of my family ghate him?
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