Wait time before sponsoring again

[Amit Bhosle]

Hi,

I sponsored the visitor visa for my in-laws 2 months back and their application was approved and they have their multiple-entry/10yr visas now.

Now my parents' visas have expired and I need to sponsor them as well. I see that I have to declare in their application that I have sponsored my in-laws (and the dates).

Is there a recommended wait time before I should sponsor my parents visas?

There's a general guidance recommending that the sponsor should show funds in the amount of $4K-5K per visitor being sponsored. Does this have to be in cash? Or other types of assets will also be fine (e.g., stocks)?

My in-laws and my parents are not going to be visiting us at the same time. Should I mention this in the letter to the immigration officer? (will that help?)

Any other tips or suggestions?

Thanks
Amit