Applying visitor visa for family members


I am in Belgium on single permit that is valid till March end 2020. My single permit extension is being initiated through the employer. In the meantime, I intend to invite my family members on a visitor visa during April/ May time frame so that they can be here with me for a few weeks (4 weeks or so). So the question is, will it be a problem if they apply for the visitor visa since my current single permit will not be valid in April, though the renewed single permit could very well come before my current SP expires. I have the D visa which is valid till Aug 2020 though. So, is it possible to use any documentation to show that the SP extension progress and the valid D visa as supporting documents in the visitor visa application? The lead time for getting the new SP is causing this confusion. What is the ideal way to deal with situation.

Appreciate your help

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