The owner is the one who is unable.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	2:det	_
2	owner	owner	NOUN	NN	Number=Sing	5	nsubj	5:nsubj	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	5:cop	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	5:det	_
5	one	one	NOUN	NN	Number=Sing	0	root	0:root|8:nsubj	_
6	who	who	PRON	WP	PronType=Rel	8	nsubj	5:ref	_
7	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	cop	8:cop	_
8	unable	unable	ADJ	JJ	Degree=Pos	5	acl:relcl	5:acl:relcl	SpaceAfter=No
9	.	.	PUNCT	.	_	5	punct	5:punct	_
