There Are Holes In The Sky Poem by Spike Milligan

Any reader will fall in love with this kind of humour.

I think this poem is a well-thought-out demolition, by the Irish bard, of the ancient Hebrew belief in the Firmament (see Genesis) , as the best way they had, to understand what was going on in the sky.

My mother bakes and cooks and reads us books

Wherever you copied this from, the last line is wrong. It quite obviously doesn't scan the way you have it (any poets here?) and should be That's why rain is thin.