Warranty Deed between family members

My older sister is wanting to do a Warranty Deed transfer on our home in Florida to my mother as a gift since my mother and minor sister are living within the home, the property is paid in full with no balances owed. The property value is $122,000. What are my tax implications? Will I owe tax on the $122,000 as income? If we sell the home for more than it's worth, will we have to pay capital gain? If we sell it for less than what it is worth, do we NOT have to pay capital gain?

Thank you,