"Do you only see your children a few times a month? That doesn't sound very specific/fixed. But maybe you're fine with it?"
Are both of the options ok? And please let me know if you have a better option than the ones presented.
That doesn't sound very specific/fixed. You could say eg That doesn't sound like a very firm arrangement. eg That sounds like a very casual arrangement.
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That doesn't sound very specific/fixed.
You could say
eg That doesn't sound like a very firm arrangement.
eg That sounds like a very casual arrangement.