Pregnancy and Parenting

Adding extra money for one child so that the investment for both children will be equal

Q: I've got two sons. They're toddlers. 

My elder son received alot of money as a gift when he was a baby while the second one didn't receive as much. I was thinking of converting their cash to gold. Will it be okay for me to give money to add only to the younger one so I can get the same amount of gold for each child or will it be unfair to the older child? 

We will not inform them of this when they are older.

Father assisting one son financially

Q: Should a parent be equal to all of their children in terms of finance and gifts? 

For example: There are 4 brothers. No. 1 is a doctor, set up by the father but paid back. No. 2 is in the business with his father as a partner, also paid back. No. 3 is still studying. No. 4 is an aalim and recently started working in the business. The father wants to set no. 4 up eventually. 

Question: Will it be fair if the father sets up no. 4 in the business, without paying back. Basically giving him a business and not giving any other brother the same.