The Tocharian B word procer
Word procer
p r o ce r
IPA proʨer
Meaning brother
See also Phrygian: ΒΡΑΤΕΡΕ ‘brother’
Phrygian: ΒΡΑΤΕΡΑΙΣ ‘brother’
Greek: φρατήρ ‘brother, phratry member’
Proto-Indo-European: *bʰréhater- ‘brother’
Old Norse: bryþr ‘brother’

Comments
Douglas Q. Adams, “Etymological Dictionary of Tocharian B”, 1999, Brill

Other words that might be of interest
klyiye ‘woman’, śana ‘woman’, eṅkwe ‘man’, śaumo ‘man’, śamaśke ‘child’, petso ‘husband’, mācer ‘mother’, pācer ‘father’, kālyśke ‘boy’, tkācer ‘daughter’, tsaṣke ‘elder’, stere ‘elder’, gottär ‘family’, klaiññe ‘female’, śamñāṃśka ‘girl’, āwe ‘grandfather’, orotstse-pācer ‘grandfather’, śāmñe ‘human, mortal’, pets ‘husband’, amārraṣṣe ‘immortal’, oṅkrotte ‘immortal’, onuwaññe ‘immortality’, eṅkwaññe ‘male’, enkwe ‘male’, ammakki ‘mother’, ṣer ‘sister’, soy ‘son’