I worked for my step dad. I did this for 5 years.
he's family, i love him, i want him to Succeed but he never gave me any reason to further his company.
he gave me a bog standard weekly wage. (better than most people round here, and better than most jobs - but not enough IN COMPARISON)
i worked my gutts out, finger to the bone, and used to make HIM a weekly fortune, taking a pittance for myself.
NOT ANYMORE! I still work with him, sub-contractor basis, going from strength to strength by myself.
(just today won new holiday complex 16 units £10 each monthly!)
My point being, if things got like this between family - if your going to employ someone else - either make it worth their while, don't bother or suffer the (possible)consequences.