A recent commission by  moorph featuring a less remembered mouse duo.

I've discussed Maramduke's nebulous age before, although less so his (theoretical) family ties. One in particular is the occasional appearance of Tiny who I believe to be his nephew. Tiny's first appearance involved Marmaduke takaing care of him over an afternoon and the usual bratty hijinks ensue common from comics of the era. You never get the sense in this or latter appearances that Tiny ever takes Maramduke seriously as an adult, which may also be especially telling in later issues when the baby mouse is now shown wearing shorts, apparently having graduated from diapers and leaving Maraduke behind in that regard. I figure then this is probably one of the sticking points in their relationship. Head-cannon mostly but hey try proving me wrong.

Perhaps equally curious though is one appearance of Marmaduke's older brother who after a prolonged stint of cross-dressing-as-disguising is shown to also wear padded attire, so maybe it's a hereditary thing from his family?