Can a parents home be transferred to my name if i have been taking care of them for more than 2 years.

You need to get a better understanding of all of the the issues involved in property.  The answer to your question is probably no way.  First any transfer of homes or land requires a deed.  Then it can be contested by your sisters if there is any evidence of undue influence or fraud.  To do it right your parents need to go to their own attorney (don't take them to your attorney or even drive them there) and they need to ask an estate planning attorney how to do it right.