In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
1) Hijab is not compulsory from one’s father-in-law. However, if there is fear of fitnah which is common in today’s society, then it would be advisable for the daughter-in-law to clothe herself modestly and to keep at a distance from the father-in-law.
2) No, this is not true.
3) If medical facts have proven that conception is an impediment to the health of the wife then she will be allowed to use contraceptives.
And Allah Ta’āla Knows Best
Mufti Saeed Ahmed Golaub
Islamic Solutions
Jamaica