Anonymous wrote:OP, you mention the parents are "a little off." Are they awkward socially or very introverted? If so, they probably don't have a problem with their son preferring to come home and be alone with his action figures. School is probably exhausting for him. You need to come up with concrete examples of how your job caring for him requires much more from you than with a typical teen. It's possible that they don't expect/want the additional effort you are putting into the job, in which case, they would not want to raise your pay.
What exactly are you being paid to do for a 14 year old in the first place? I can't imagine it's much, certainly not enough to warrant a raise.