I don't know what to do, The house is falling apart?

My dad is the patriarch our undivided family ( 5 families ) living the same house, shared properties in a unregistered trust. Dad is an old school patriarch who managed the affairs of the family so far. managed funeral ceremonies of his cousins whose children. He arranged marriages of his cousins children, undertook the weddings, bearing the expenses,

Now he is aged, disabled now my elder cousins want the position my dad held all these years where he basically managed all expenditure of the family properties. Which are not shared but belong to Individual names. We have been living in an ancestral house all 5 families have been sharing since 5-6 generations that I am aware of.

Now my cousins want my dad to pass on the baton to them. My dad doesn't his children Me & My brother to step in, but neither of us have the skill or the heart to handle it but, because we cannot disappoint our dad neither can we not give up. Dad has built up a legacy of his own & has a big name in our social circle of villages so everything is at stake for him but his children me and my brother are completely different and don't have the substance. What to do is a big question? Even our income will be jeopardized if we don't step in?

Should I fight for something I don't have heart for or should I just hang on till dad is alive?