So the second generation of immigrants are not immigrants. Glad we got that sorted.
All kids demand resources. All old people demand resources. All middle-aged people demand resources. All developing young families demand resources. You could say everyone demands resourcres. It isn't limited to a small group of specially selected few.
If it wasn't for the immigrant workers the NHS, Care services, hospitality industry, etc would collapse.
It's mainly the older, professional and non-EU workers that need to bring their familiy.
The majority of EU workers were young, healthy, unattached and intent on returning home at some point.
Brexit has increased the number of family members coming to the UK, and the non-EU immigrants are more permanent settlers.