You're a migrant non-taxpayer.
I know it will be difficult to stretch your imagination, but indulge me. What if these family members learn English. What if these family members make dedicated efforts to get UK qualifications (education is highly prized in Gaza). What if these family members then get jobs and start paying tax. What if, as a result of the support the UK initially gave, they become high earners, paying lots of tax and supporting the community through, say, being doctors, or teachers.
Why, then they'll be no different to your children and husband. Different to you, of course, because you don't work and don't pay employment taxes.