I think my wife uses a similar line to direct the kids towards me. I know she just says "Ask Dad" if the questions are anything related to comic books, Star Wars or health/medical topics.
Our family consists of, Mom- English. Dad- everything else, I have had to resort to getting the kids to baffle the teacher with BS sometimes. Oldest kids have used the line, dad said he taught it this way while lecturing at Waldorf College (now Waldorf University). At minimum they will get like 3/4th credit no matter how wrong they are with that answer.