It isn't only Tom she takes care of. She was the only one there for me at my worst time ever. Stoic, strong, doing what she had to do. Here are beautiful flowers she planted to decorate her dad's deck after she gently(?) pushed him to finish building it. And, yes, she does know her way around tools and pitched in for the construction.
As you can see, the caretaking started at an early age. Despite some bloodletting between the two during adolescence, I don't know of any brother and sister who are closer. Sometimes I call them Bessie and Phil -- referring to their dad's aunt and uncle who were each other's sole companions for life.