These don't work when it's all just months.
Believe me, I definitely get this game. That's why it doesn't work with just Months (especially if you use it with that many different family members). You need different kind of categories, like Days of Birth, First Letter of your First Name and others, so you have way more variety in the answers... otherwise it's just for everyone born in the same month the exact same family, so it's 12 combinations and that's it.
Cass