Dear Rabbi: During the heat of the summer days our small children play in the backyard around some water sprinklers to keep cool and enjoy themselves. Is there a problem if their parent play with them to keep them safe, but also get wet during the Nine Days?

Poskim permit young children to get wet outside during the Nine Days. (Kovetz Halochos 14: 3, and others). It stands to reason that the ones taking care of them in need can also get wet. (See question 1736 regarding working as a baby swim instructor during the Nine Days).