i think you need to give your kids some stability. moving like this every week will only create chaos and uncertainty and they will not be able to form a routine.
a 21 month old is very young to understand these constant changes. why don't you ask teh grandparents to come over for the weekends? you can go for one weekend or for a day visit sometimes. it is important that children know their bed and space, as it helps them relax and sleep well too.
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