Masha appeared on Hey!Hey!Hey! broadcast on 29.08.2011 to talk and sing Kazoku ni Narou yo, and I didn't even remember. Anyway can't find the talk part but found the singing part, thanks to youtube! Anyone with jpopsuki account can find this performance to download in much better quality eventhough this is not bad.
Or watch the talk AND performance here at Tudou, link thanks to Thitirat.
And thanks to Vspirit who posted a very funny snippet which you can see in the Tudou clip;
i can't seem to find the first part so i dunno what amemiya sang about fm but the very last bit where he mentioned there was a small part that had to be edited out due to the "sensitive" nature of the content (which fm seems to both dish out and inspire in spates), fm was like "sing it sing it i wanna hear!" so he did and it went:
♪So the 4000g baby is now going to elementary school And cos he wanted so much to become the class clown, the boy, he climbed up a desk, introduced his peepee and flashed everyone around~♪
(to which fm good-naturedly--actually he seemed very happy to be exposed as a perv from young-- verified straight away as a true story)