Is it better to repeat Hajj for himself or to do Hajj on behalf of his relatives?

Entering ihram for Hajj or ‘Umrah on behalf of two people

Ruling on doing tawaaf during the Friday khutbah

Going out of Mina by day and coming back at night during the days of al-Tashreeq

She took out a riba based loan and she wants to go for Hajj using her salary

She is not sure whether she cut her hair properly in order to exit from ihraam for Hajj. What should she do?

Should he pray istikhaarah before performing Hajj?

She vowed to do Hajj but she has not done the obligatory Hajj

Is it permissible to do Hajj on behalf of one person and ‘Umrah on behalf of another in the same year?

Should he do Hajj on behalf of his grandmother even though his father does not approve?