I would definitely have both children together, unless the elder is still jealous of the baby.
This is after all the period of their lives where it is essential that the two children really can begin to feel that they are siblings.
In my experience looking after two children is no more tiring than one at a time.
To start off with you will be tired whatever you do, but once you have established a routine for all three of you, that will wear off.
Or at least, if it doesn't you will have to regretfully inform their parents that you are too old to look after such small children.
How to Keep Living at Home Longer
When a political leader lies on their CV - can you trust them?



