I know someone who was big-hearted (dumb) enough to let a homeless couple camp on his property. They became unwelcome squatters and many months and dollars later he finally got the necessary legal papers and the sheriff to escort them off the property. Let that be a lesson to anyone reading this.
In most states, once you invite someone into your home, it requires a lengthy legal process to make them leave. If you invite them in, it’s now their home also.
One does have to set limits.