Hybrid Marmosets? Callithrix/Mico species

hybrid Marmoset
hybrid Marmoset
hybrid Marmoset
The above marmoset, living with a Black-tailed Marmoset, would appear to be a hybrid, possibly of a Black-tailed (Callithrix/Mico melanurus) and a White-tufted/Common (Callithrix jacchus). It has some of the Black-tailed traits but a back and tail more like the White-tufted or even the Geoffroy's (Callithrix geoffroyi), but the ear tufts indicate the former.
hybrid Marmoset
hybrid Marmoset
hybrid Marmoset
This younger marmoset living with them also has traits of Black-tailed and White-tufted. It may be the child of the first suspected hybrid (although marmosets usually have twins).