SOLVED: 3 Euphorbias to be ID-d.
#1 and #2 are cultivars of Christmas Poinsettia, Euphorbia pulcherrima and
#3 is Garden Spurge, Euphorbia hirta.
Milky stems may be Euphorbia but other families like Apocynaceae have milky sap too.
Worth mentioning that Euphorbia hirta is usually included in the segregate genus Chamaesyce, as Chamaesyce hirta...