My Grandmother has been asking me to install a stackable washer and dryer in her half bathroom. She wants to convert her sink into washer and dryer hook-ups and then install the stackable washer and dryer. Is it possible to convert the sink over to the hook-ups necessary to install and washer and dryer? Also if so how would I go about doing this? Thanks.

It really depends on how the lavatory is roughed in.

If the original Plumber plumbed it in to the minimum standards, then the drain is likely only 1-1/2", which will not be sufficient in size for a clotheswasher.