Returning stolen money when profits have been made from it
Question

                I swindled some money from some orphans. Then I invested it in a trade 
and it proved to be very profitable so that it came back to me manifold. 
But fear of Allah has overtaken me and I want to repent. How do I do it?
Praise be to Allah.The scholars have expressed different opinions. The moderate and most just opinion is 
that you return the entire original sum to the orphans plus half of the profits, as if you 
and they had been partners with their capital and your labor, hence the division. 
This ruling has come from Imam AHED. It is also the opinion of Ibn Taymiyya which 
his pupil Imam Ibn ul-Qayyim prefers. This also applies to the situation in which you 
have rustled a cattle which gives birth to calves. The cattle must be returned and the 
calves must be split. If the original cattle dies then its price plus half of its calves must 
be returned.