To "grandfather you in" typically means allowing someone to continue benefiting from certain privileges, rights, or conditions that they already have, even though new rules or requirements have been established that would otherwise exclude them. This phrase originates from the idea of a grandfather clause, which was a legal provision that exempted certain people or entities from new regulations or restrictions if they had already been doing something before the new rules were enacted. So, when someone says they will "grandfather you in," they are essentially allowing you to maintain your current status or benefits despite changes that might affect others.