Lena Haag
Of course it is not a cure, but you would think Randall would avoid harming his girlfriend's family.
What evidence supports that?
Besides, he would have known Beth for all of 2 days. That's not going to stop him from having the desire to survive at whatever costs.
It's a fairly large leap to assume that him having feelings for Beth would mean he'd protect her family. Look at Glenn and Maggie. Glenn feels no special ties to the farm family just because he's with Maggie. His feelings are specific to Maggie and only Maggie. If it came down to Rick's group or the farm group, chances are higher that he would band with his own group.
IN FACT, he did just that when Maggie asked him not to tell his group about the walkers in the barn. He turned around and told Dale about it. So no, Randal dating Beth means nothing for her family.