Chinese is replete with homophones. Some seem to be cognitively related. Let’s have a look at the phoneme yu2, usually in second tone.
于 余 与 all three are yu2 and are high frequency connecting characters! AT, EXCESS, RECEPTION
与 AND 宇 yu3 universe (image: a child underneath the sky-dome!.
与 PARTICIPATE 欲 yu4 DESIRE
AT, In, From. Can also function as a question particle like ma at the end of a sentence, that usage however seems literary to me as opposed to colloquial.
Extra Surplus Excess, Left over goods. Image is a house under construction with surplus material scattered about. AT this House is EXTRA construction material.
与 yu2 yu3 yu4
This one is the idea of mutuality, especially the mutual relation of reception by the younger generation from the donation of the elder generation.