However one can't be all Ack!! with my s-i-l, is probably why my brother married her. Instead I turned to my kitchen drawers and found my own thermometer, unused since 1998 I believe (never ever throw anything away) and gave it to her when she failed to find any of their own.
With which she has ascertained that he has a fever of 98.8 with no other symptoms beyond malaise. The Cassandra in this corner is cautiously relieved.