Can you ask a step parent to write a letter of recommendation? And also are they able to?

Please no sarcastic answers. And serious inquires only.Can you ask a step parent to write a letter of recommendation? And also are they able to?
If it's not appropriate to use a parent, then step-parents would also fall into that category. It's not about the biological connection, it's because of the relationship that you are assumed to have.Can you ask a step parent to write a letter of recommendation? And also are they able to?
no in college and work applications they are considered to be like parents.


but, parents girlfriends and boyfriends are acceptable.