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In terms of avoiding risque subject matter:
Sora, Ina, Azki, Aqua, Mio
Some other talents do engage with the above, but typically have pretty comfy/wholesome streams:
Fauna, Mumei, Watame, Korone
As far as Hololivers I think kids would actually gravitate to though, you gotta keep in mind that kids have short attention spans, and it'd probably be more bombastic talents like:
Pekora, Miko, Kobo, Fuwamoco, etc
Fact of the matter is that what you think is kid friendly, and what your kids will actually want to watch is probably gonna deviate significantly.