If one family member has a planet exalted and another has it debilitated, should that planet's items be kept in the interior?
Decide room by room. In your own bedroom use the materials of your exalted planet and not of your debilitated one; your daughter's bedroom is designed from her kundli. The house facing and common areas such as the drawing room and kitchen are decided from the grih swami's kundli. Many people make the master bedroom in the South-West by default, which is wrong when Rahu is debilitated: such people suffered there and got very good results after moving to another direction.
Related questions
A couple sleeps in the SW; one has an exalted Rahu and the other a debilitated Rahu. Can they sleep there?
Yes. After marriage, as in the hathleva ritual, the planets of one partner overlap the other, and the exalted planet's influence prevails.
Why is sleeping recommended in the South-West or the South?
Sleep is an activity of Saturn, and Saturn is a friend of Rahu-Ketu, who rule the South-West. The South is the seat of Yama, before whom no one prevails. Sun and Saturn are enemies, so sleeping in the East brings husband-wife quarrels; only a king-like person such as a politician or minister can sleep there. Applying this friend-enemy logic of the planets to every activity lets you derive remedies yourself.
A client has an exalted Saturn and a debilitated Venus. Can the bedroom be made in the West?
Yes, it will be very good. With an exalted Saturn, make the bedroom in the West without hesitation; WSW or even SW can also be used, but when Saturn is exalted the West gives the best results.
Does Rahu in the 8th house also rule out a South-West bedroom?
Check only debilitation, not the 8th house. Not every 8th-house placement is bad.
Does being manglik stop a person from sleeping in the South-West?
Manglik has nothing to do with it. It is considered only at marriage matching, when Mars sits in the 1st, 4th, 7th or 12th house, and Mars is power, not inauspicious. For the SW check whether Rahu-Ketu are debilitated, and for the South whether Mars is bad.
Rahu is in Mesh in the 10th house. Can I sleep in the South-West?
Yes, you can; Rahu in Mesh is not debilitated.