It rocks that Mac Em and Silas take Brother Sister Day very seriously.
They "bonded" on the Coronado ferry, hunted for Green Day CD's and proudly turned Silas into a "Green Day Nerd", sang "bullfrogs down by the banks of the hanky panky" while they waited in lines, decided on sweet stuffed animal gifts to each other, played guitars together and Mac and Em watched Silas' first swimming lesson with great interest ("he's sooo cute") and concern ("he's scared to put his face in") and cheering all around ("yay Silas!").
There was a lot of love in this day and I was happy to watch it happen.

