How many add-on credit cards can I get?

I do not get any grace period on my card, while my partner does and we have credit cards from the same bank. What can I do to get the grace period?

Do all credit cards get access to airport lounges?

Add-on credit cards are best suited for whom?

How does credit limit work in case of add-on credit cards?

For which of my family members can I get an add-on credit card?

How do banks charge for add-on credit cards?

My dad has a credit card which has a credit limit of Rs 1,00,000. He has recently applied for an add-on credit card for me. So, will I also get to spend Rs 1,00,000 monthly?

Where can I get my credit report?

How can I get a free credit report from any of the credit information companies?

What does my credit score have to do with my loan getting sanctioned?