I'm running the GNR with my (much younger) sister next month. She's been running on and off for a lot longer than I have, but I've done a marathon and she hasn't.
Our (Scottish) family, parents excepted, are stingy gits when it comes to sponsoring us. Sheila Anne's bet has just given me an idea. Perhaps they'll contribute a farthing or two if we run a sweepstake on which of us will be fastest and by how much.