My kids go to two different dance studios- question about whether I should let people know, or not say anything.
My oldest child currently goes to a competition-heavy studio and is on the team. "Studio A". She loves it.
My younger child plays several sports and is in Girl Scouts. She has no interest in being a competitive dancer.
My younger child wants to take a tap class, but doesn't want to go to Studio A (it's very serious; it's farther away, and it would conflict with her other activities). So I found another studio that is closer to our house, cheaper, and recommended by people we know. She started last week and loves it. She is only taking one tap class a week at "Studio B".
Studio A knows we are going to Studio B, and they don't care.
I've never said anything to Studio B, or even that I have another kid that dances. When I registered, there were no questions about attending other studios; there's no dance contract.
I'm not the kind of asshole that would ever wear Studio A merch to Studio B, talk about Studio A to parents, or recruit other families. Studio A and Studio B have never competed against one another- they go to different types of comps. I think it's unlikely that they would compete against one another, but I suppose it's not impossible.
Do I need to tell Studio B that we have a kid at Studio A? How would I even bring it up? If I don't need to say anything, I'm content not to. But if it's rude not to mention it, I'll tell them.