Is a free Hajj valid for someone who goes with her brother, who works in pilgrim guidance services, and is it better for her to pay for the Hajj from her inheritance or not?

It is permissible to perform Hajj for free using the seats allocated to your brother, and your Hajj is valid whether it is with your own money or for free; for it is not a condition for the validity of Hajj that it be performed with the pilgrim's own money. It is a condition for the validity of waiving an inheritance that the one waiving it be an adult and of sound mind.