Just in case.

Dear Joseph,

Just in case it happens that one of your future children has an artistic streak which demonstrates itself in random impromptu moments when paper may not be around and so surfaces, not intended for such outbursts, are used instead. For example maybe they draw, no maybe they paint on your newly cleaned sofa, rug and carpet, perhaps a little like this ;

Just remember, your mum forgave* you xx

* by the evening when Daddy had cleaned it up with a rehired rug doctor!