Combining 2 family's both with kids?

My step son has recently asked if his girlfriend could stay with us once she is released from the hospital, we are already staying in a hotel and his mother is also living with us in a 2 bed hotel room my oldest son is currently homeless and being winter I want to do whatever I can to help him however he has a job and would like to stay homeless if that's what it means to keep his job... I don't know how to handle the situation my son is homeless but should I let my stepsons girlfriend stay with us also we are struggling everyday just to make sure we have a place to stay?
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Okay to clarify the girlfriend is my boyfriend's son's girlfriend they were both in a head-on collision car accident his son is in the hospital and will be in the hospital longer than she will be he had a place for her to go with him but they will only allow her to go there if he's there which is my boyfriend's son's mother's place they don't want her there without him because apparently his mother has trust issues and doesn't want any girls there temptation for her boyfriend
Combining 2 family's both with kids?
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