William Thomas as Buckwheat
and I think the other child is
Eugene Gordon Lee as Porky
I'm not sure which show had a monkey in it.
On a side note:
Porky originated the catchphrase "O-tay!", though it is commonly attributed to Buckwheat.
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Our Gang (also known as The Little Rascals) is a series of American comedy short films about a group of poor neighborhood children and their adventures.
Starting in 1922, the Our Gang series includes 220 shorts and one feature film, General Spanky, featuring over forty-one child actors.