The construction of a family like building is only possible when there is a foundation. No palace can be constructed without a foundation. Even for a hut four supporting beams are needed. Those beams have to be buried deep otherwise the hut will be laid low. If the foundation is seen above the ground then palace cannot stand for long. If foundation is deep then palace will be lasting. Old persons of every family are like the foundation pillars or the hidden punya (merits) of a person is like foundation. If you want to make your life like palace strong then do hidden punya (good deeds) and serve old people.