Dear Loser,
Learn this well: Your value as a person isn't determined by names like 'slave', 'servant', 'halfling', 'slip'.
What does determine your value as a person, then? The strength and grandeur by which you dominate everything about yourself; your usefulness to your superiors.
If your father dominates your town with bribes and threats, then he is an admirable person, at least by townie standards. If he judges you less useful to him than halfling slaves, and your place accordingly below them in his household, I shan't gainsay it without knowing more of the matter.
You haven't told me a single thing about your father to make me believe he has a heart stuffed with angel feathers - just that he has a treasured adviser whom you hate for being better-treated than yourself. But if you really believe your father guilty of heresy, why not turn him in to the town priest over it?
To be clear, if the town priest is then found dead in the river, we shall, in fact, have a problem on our hands; and if you afterwards steal a horse and set off to the nearest larger city to report to the temple there, you will be well rewarded.