I will travel to a conference at which I will present my work. My funder usually reimburses me for fees of conference registration, travel, and accommodation.
However, since my wife and kids will accompany me, I will book separate travel tickets for them, and a family room, which is usually more expensive than a single one.
I will ask the funder whether/how they would reimburse me for the accommodation.
I guess many other academics around the world travel for work with their partners, friends, or families, and I am wondering how they usually/ideally get fair reimbursement for accommodation shared with other non-funded travellers.