Lydia is just getting into really playing with her siblings rather than just watching or playing along side of them. One example of this is how she playing Ring-Around-the-Roses with them:
As you can see it can get a little wild around our home. Whenever there is a parent or sibling on the floor it's a sign of an automatic wrestling match for Lydia and Christopher :) Poor Daddy, he's been dealing with some cold/illness symptoms so he wasn't feeling very well as the kids took him on!!!