well it really depends sa family. it would be hard to classify those people as men without balls because they may have a sound reason naman. what if they're the only heir? or 2 lang sila na anak? there are a lot of reasons.
on the other hand, if ikaw nga naman inside the family, the word of caution always is ingat ka sa mapapangasawa mo. kasi kadalasan sila naninira ng harmony and unity. walang magbabalat sibuyas ha, this is true up to a certain extent. and it hold true to families not just family businesses.
but for me, if i were the Patriarch, i would treat my children professionally. Work wise, i will treat them like an outsider: Here's my compensation, bahala ka na what to do with it with your family. you don't have to live with me, i won't meddle with your affairs, i will not be like Howard's mother in Big Bang Theory. basta do your job well. and keep our secrets safe. malasakit is the trait that you can easily find in family members.
inside and outside the house, i will treat them professionally. unfortunately, kakaiba ang ugaling matanda sa Pinas. or maybe even the family business model in the Philippines. but mind you, there are beautiful familes out there. and i've met some of them. You'll die with envy.
so have a chat with him. ask your bf, what's in it for him in terms of the Family business. Let him know kung ano ang ayaw mo na set up sa family business. if its big, he'll get to gain a lot of experience. so if experience is what's he is after, hanggang kelan?
if he plans to work after that, well, some companies frown at applicants who have worked in family business. kasi how nga naman can they truthfully know how good a worker is he? second, working in the family business has been the eternal excuse for bums. so how will he get work after that?
if he plans to go into business, then what are his plans, make a 5 year plan for the both of you.
there are two options. Option A: if the family is just going to be controlling, and hindi sila professional enough to give space to you guys, and respect your space etc, take off! make your own business.
option B would be to stay. but he should give you an idea on how he will be able to support you. he should lay down the cards and show you what you will be getting into.
personally, given the probability of having an "enlightened" family business model. i bet my money on Option A.
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On a side note, leaders should really have a high level of enlightenment. unfortunately, Patriarchs fail to be such and end up as dictators.