Mairi and the children were at the Science Fair where there are lots of hands-on exhibits. I can see one or other of these two becoming an engineer. Maybe Alastair is the Get in There And Get Your Handsy Dirty type where Ishie might be the Ordering Everyone About type!
It reminds me of a cartoon Iain showed me once: Leonardo da Vinci's mother was leaning on the garden fence chatting to the lady next door. Little Leonardo is playing on grass at his mother's feet. The lady next door is looking down at little Leonardo taking apart something on the grass and wistfully says to his mother "It's too bad little Leonardo just wants to become an engineer."