Really -ambiguity is my God

I have been thinking today, and so you might see,

That I've got no one to leave my estate to, as it might be.

My mum and dad have got money to spend,

 And my sister is definitely on the mend.

My niece and nephew therefore have cash,

So I suppose I shouldn't be rash.

Then there is Sarah, my ex girlfriend, and to recourse,

Her boy is not mine, and I have no remorse.

It's a quandary and that's for sure. So it seems I have to live by force.

Until, when I die, I have someone  to give to, because, there it is, they are the laws.