So my husband has 2 brothers and one sister

So total grandkids theres 1 girl and 3 boys

Now that im pregnant again everyone says its gonna be a boy because theres only one girl. And my husband has brothers and only one sister. Its not a big deal it just bugs me that they say it like theyre 100% sure. If all brothers each had 3 boys each id kinda understand where there guess is coming from but in reality theyre basing it off 2 brothers who have one son each cus the other brother has no kids.

The sister has one each but theyre also from different dad so i dont see how that would predict what im having.

Im just annoyed cus they make everything a competition. My son is the youngest and my BIL son is 9 months older and they compare everything they do or dont do... and shortly after my son spilled were having a baby now they want to ttc, even they had said they dont want any kids rn