Jack has done enough breeding for the whole family, so they will be with us for many a year.

I forgot to add that I found out the brothers' full names.

Tige is Tiger Napoleon Alexander Adolf Attila Genghis Caesar Tamerlane McBride the Fourth.

Jack is Jackford Necronomicon Miskatonic Cthulhu Innsmouth Dunwich Mephistopheles McBride.

I think this really explains a lot of what is going on.