Football causing issues between dad and Husband

[Nowheretogo1985]

Hello!
Anyone got any advice please? It sounds ridiculous but football is causing a problem between my dad and Husband.
Both are passionate about the teams they support (both different) but my husband doesn't want my dad talking to my son about the team he supports as he feels like my dad is trying to coax him away from my husband's team. If that makes sense!
My dad wants to take my son to a match but husband won't allow him.
My husband came home from work last week and my dad (who was looking after my children) had drawn the emblem of his football team on the children's chalkboard. Words have been exchanged via text between both men (my husband asked him not to do such things) and now I feel like it's awkward. I can see them really falling out over it.
I'm just not sure what to do 😭
Sorry if it's sounds trivial but I'm bot sure what to do!!

OP would you think the same if your Husband was a Labour supporter and your dad was drawing the Conservative party emblem on the children's chalkboard? Or if your husband was Christian and your dad was drawing a satanic pentagram on the board?

That's quite a stretch florenz