My in-laws spent all weekend doing this to my son so he could gum their fingers. The day after they left he had a bit of an upset tummy (although the two may not be related). I find it quite revolting and have asked my husband to ask them not to do it if we see them doing it again. He's agreed so I don't think he thinks I'm being unreasonble but I wanted to see what others thought. Also, I'm worried about offending them, but should my feelings on this be more important?!
Thanks!