Husband Wife Relationship in Islam is considered to be the most important of all relationship the Almighty God has created. The Holy scripture has described this relationship to the likeness of Libas (clothes). As one takes care of his/ her clothes and prevents it from getting soiled, so are Husband and Wife admonished to take care of their relationship and lead a peaceful life.
A lecture in urdu by the current spokesperson of All India Muslim Personal Law Board Maulana Sajjad Nomani on husband wife relationship is a very good starting to point to understand this- http://www.taubah.org/Bayans/2011/11/2011-11-20-Khush-Gawaar-Izdiwaji-Zindagi.mp3
Sexual Relations between husband and wife in Islam
A guide to sexual relations in Islam by Mufti Muhammad ibn Adam al-Kawthari is good place to learn about this subject. It is downloadable at this source.
Relations with your in-laws according to Islam?
Here is a guide by Sheikh Zulfiqar Naqsbandi on how to maintain healthy relationship with your in-laws according to Islam and how a ideal father-in-law, mother-in-law, daughter-in-law, son-in-law, husband and wife should be according to the teachings of Islam. All these lectures are in URDU.
Ideal Father in Law in Islam
Idea Mother in Law in Islam
Ideal Husband According to Islam
Ideal Wife according to Islam
Ideal Son in Law in Islam
Ideal daughter in Law in Islam