For shanti at home, especially when there are relationship difficulties in marriage, the most respected Jain recitation is:

1) Navkar Mantra

णमो अरिहंताणं णमो सिद्धाणं णमो आइरियाणं णमो उवज्झायाणं णमो लोए सव्वसाहूणं

Meaning: I bow to the Arihants, Siddhas, Acharyas, Upadhyayas, and all Sadhus.

How to recite:

• Recite it 9, 11, or 108 times daily
• Best done morning and evening
• Sit calmly, with a pure and peaceful mind

2) Kshamapana / Forgiveness prayer

A very helpful Jain prayer for reducing anger and tension is:

खामेमि सव्वे जीवे, सव्वे जीवा खमंतु मे मित्ती मे सव्वभूएसु, वेरं मज्झं न केणई

Meaning: I forgive all living beings; may all living beings forgive me. May I have friendship with all beings, and no enmity with anyone.

3) Practical Jain way for peace at home

Along with mantra, Jain Dharma emphasizes:

• Ahimsa in speech and conduct
• Kshama: forgiveness
• Mild speech
• Self-control
• Avoid harsh words, ego, and anger

Simple daily practice for family peace

1. Light a lamp if you wish, with devotion
2. Recite Navkar Mantra 11 times
3. Recite Kshamapana prayer
4. Sit silently for 5 minutes and pray for right understanding, forgiveness, and peace in the household

If you want, I can also give you a short Jain prayer for husband-wife harmony in simple Gujarati or Hindi style.