Very often, when tragedy strikes a family, it causes anger and hostility, and eventually, splits up a lot of families. I think it is very touching that the Anthonys stick together in their support of Casey and are united in their love for each other. They have chosen to say to the world, "You may hate and despise us, but you will not break us apart."
Lee also said, "...but this family is incomplete... I am incomplete." Obviously, he is torn because his sister is in jail accused of murdering her baby girl. This has to be one of the hardest things to deal with in any family. They have lost a beloved niece/grandchild, and their sister/daughter is facing a trial for causing that loss. Ask yourselves how you would deal with that. Put yourselves in their place and try to figure out if it would make you feel better to hate your sister or daughter, and turn your back on her... or would you prefer to band together and draw comfort from each other, in the hope that someday you would find peace. I know what I would do.