Elderly under paying tenant

[Brett Staples]

so im looking into buying a 2 family. the issue is the tenant has been on lease for 10 years,  she is disabled, 60 years old and pays 740 dollars a month for a spot that could rent as high as 1100. Morally I couldn't kick her out but maybe I could rent out the other room to another disabled elderly woman? Great property, low crime area. would love to hear thoughts or advice if I should even consider this property. Second floor pays 1050