After changing to kaigo visa

Please give me advises and clarity.

Once I change my visa from designated Activities to Kaigo visa can I apply my dependents at the same time?

I am currently on shared house if granted with designated Visa my dependent will be living with my in-laws in different Ken. My concern right now is Will the shared house status affects the dependent visa application?

I am planning to change Job from Ibaraki to Yokohama (In laws are living there) to be near with the family. Will it affect my dependent visa application If I change job first before applying or Wait for my dependents to get approved before changing company? (I fear that changing company will affect my tax payment which been paying for 3years with current company) or as long as I have contract it doesn't matter? My current company have low salary and compared to where I am planning to apply. BTW my tax is around 3.1M yen will it suffice a husband and daughter for dependents?

Thank you in advance.

by StopExternal5342