ILR qualifying period start date

Hi Team,
I have switched from ICT to skilled worker visa in 2021

1. I submitted my Skilled Worker visa application online on 07 April 2021, from inside the UK,I have the IHS and application fee confirmation for this date. ⁠
2. ⁠UKVI biometrics submitted & Skilled worker visa application approved on the same day 05 May 2021
3. My Certificate of Sponsorship (CoS) stated a start date of 15 July 2021, which is also the day I began working for my sponsor.

Question:
Can I submit my ILR application 07 April 2021 +5 Years - 28 day (e.g March 2026)?

Can I apply ILR for my family members as their dependent visas approved along with my skilled worker visa? if not when is the ILR qualifying period start for the dependents?

Yes, you can all apply together. I assume your spouse has more than 5 years as your dependant partner, given you were under ICT rules