I'll start with a few suggestions and then tell you what I liked: first of all I'd recommend you to keep in mind to always capitalize "I" and "Lord" as you're refering to the Almighty. Also try to focus more on the flow, than for it to rhyme.
he don't care for you, -> doesn't
he has a very bad luck -> without "a"
for if she goes and leave me here -> leaves

I think you did a good job with telling this story and though you're not pointing out the obvious, it's definately understanable what you're trying to say. The fact that you directed it to your mother made it even more personal as it already is and it seems like you're trying to open her eyes by telling her out of your point of view what kind of threatment he gives to her.

"(be)cause he pricked into the thorns instead of taking the rose"
^ I think that this is a really interesting verse as you do see the beauty, but are so overwhelmed by it, that he probably just want to take it, without realizing the risk (picking into the thorns).

This poem does have potential! :)