How many bedroom house should you have with these amount of people? (just a rough idea)?

Twin girls ( ages 12)
A girl ( age 8 )
A boy (age 5)
A boy ( 5 months)
+
Mother and father,
How many bedroom house should I have and who should go in what.

(I currently have a 2 bedroom house:( , so I want to know ASAP so I can move)

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