Minor property related

Hello Sir/madam. Recently we got property which is for sale. Its registered in the name of 8 people. 4 couples ( wife and husband ). It's their self earned property and not an ancestral property ( Vacant land ). They got it registered in 2006 in thier name as an undivided property and as of now couple of men among those 8 have expired. One among the expired has two sons who are majors and will participate in the registration of sale deed if we buy it now. But another person who passed away has three daughters who are minors. Their mother ( wife of expired person) is also one of the 8 title holders. Now what is the safe way to get the property registered in our name? I'm worried about the three minors who will get the right as legal hiers of their father who expired. Need a good suggestion please. Thanks a lot in advance for your time and valuable suggestions.