These are not family. Jabir is a sahabi who reported from the Prophet. From him the second generation passed it on to the next to the next and so on. People memorize and through oral transmission they passed the knowledge.
There are hadiths yes, which have from a chain sahabi to his son to his grandson to the next or to another man, but that does not mean the hadith is weak or fabricated. You can have other chains of narrators that are reporting the same incident.
Yalaxow, you said ahadith is a part of the sunnah. You have read these hadiths which talk about 'Isa returning, why don't you trust them?
bukhaari lived about 200 years after generation of prophet including that sahaabi you called
JAAABIR
so called chain of narration is who reported after JAAABIR?
and WHO REPORTED after the man who reported jaabir and after and after and after after of 200 years of generation?
often those chain of narration come from family abtirsi . grand grand grand sons of jaabir ayaa chain of narration ama silsilada dadkii soo wariyey badanaa ay isticmalaaan.
masalan axaadiith waliba wuxuu ka bilaawdaa waxaa soo wariyey ABU HUREYNA ama qof kale AMA HEBEL HEBEL. abu hureyra maaha SILSILADA SOO WARINTA AMA CHAIN OF NARRATION. chain of narration waa dadkiii oo BUKHAARI ka soo qoray axaadiithka. dadkaa halkee ayey ka keeneen axaadiithkaas. magacii qofkii uu ka soo qoran. qofkaa yuuse ka soo qoray isagana and so ON?
bukhaari waa from PERSIA he was not even arab. and all other MAJOR HADIITH COLLECTORS COME FROM PERSIA
daawoood=persian
MUSLIM=persian
tarmidi=persian
dhamaantoodna waxay noolaayeen from 200 years after prophets time to 600 years from prophets time.