Can two roommates who each have their own children claim head of household filing status at the same address?
Maybe. It depends on your specific facts and circumstances. You might want to talk with a tax professional to find out if you both can file as head of household.
First if you are claiming head of household with roommates, you must be able to prove you actually have two separate households despite your shared housing situation. One way to show this is if each of you pays more than half of the household costs your respective family incurs.