It is narrated from Sayyiduna al-Miswar (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Fatimah (may Allah be pleased with her) is a piece of my heart; whoever causes her pain causes me pain, and whoever gives her joy gives me joy. All lineages will be cut off on the Day of Resurrection except my lineage, my tie and my relation by marriage."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13395