In terms of their glow, I suspect that it's not theirs - although luminescence is common in anemone relatives, they don't usually make light themselves.
1	In	in	ADP	IN	_	2	case	2:case	Discourse=attribution-positive:81->82:0
2	terms	term	NOUN	NNS	Number=Plur	8	obl	8:obl:in	_
3	of	of	ADP	IN	_	5	case	5:case	_
4	their	their	PRON	PRP$	Case=Gen|Number=Plur|Person=3|Poss=Yes|PronType=Prs	5	nmod:poss	5:nmod:poss	Entity=(45-abstract-giv:inact-cf1-2-coref(34-animal-giv:inact-cf4-1-ana)
5	glow	glow	NOUN	NN	Number=Sing	2	nmod	2:nmod:of	Entity=45)|SpaceAfter=No
6	,	,	PUNCT	,	_	2	punct	2:punct	_
7	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	8	nsubj	8:nsubj	Entity=(3-person-giv:inact-cf3-1-ana)
8	suspect	suspect	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	0:root	_
9	that	that	SCONJ	IN	_	13	mark	13:mark	Discourse=adversative-antithesis:82->85:1
10-11	it's	_	_	_	_	_	_	_	_
10	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	13	nsubj	13:nsubj	Entity=(45-abstract-giv:act-cf1-1-ana)
11	's	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	13	cop	13:cop	_
12	not	not	PART	RB	Polarity=Neg	13	advmod	13:advmod	_
13	theirs	their	PRON	PRP	Number=Plur|Person=3|Poss=Yes|PronType=Prs	8	ccomp	8:ccomp	Entity=(83-abstract-new-cf5-1-sgl)
14	-	-	PUNCT	:	_	18	punct	18:punct	Discourse=adversative-concession:83->84:0
15	although	although	SCONJ	IN	_	18	mark	18:mark	_
16	luminescence	luminescence	NOUN	NN	Number=Sing	18	nsubj	18:nsubj	Entity=(84-abstract-new-cf6-1-sgl)
17	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	18	cop	18:cop	_
18	common	common	ADJ	JJ	Degree=Pos	27	advcl	27:advcl:although	_
19	in	in	ADP	IN	_	21	case	21:case	_
20	anemone	anemone	NOUN	NN	Number=Sing	21	compound	21:compound	Entity=(78-animal-giv:inact-cf2-2-coref(85-animal-new-cf8-1-sgl)
21	relatives	relative	NOUN	NNS	Number=Plur	18	obl	18:obl:in	Entity=78)|SpaceAfter=No
22	,	,	PUNCT	,	_	18	punct	18:punct	_
23	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	27	nsubj	27:nsubj	Discourse=explanation-evidence:84->82:1|Entity=(78-animal-giv:act-cf2-1-ana)
24-25	don't	_	_	_	_	_	_	_	_
24	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	27	aux	27:aux	_
25	n't	not	PART	RB	Polarity=Neg	27	advmod	27:advmod	_
26	usually	usually	ADV	RB	Degree=Pos	27	advmod	27:advmod	_
27	make	make	VERB	VB	VerbForm=Inf	8	parataxis	8:parataxis	_
28	light	light	NOUN	NN	Number=Sing	27	obj	27:obj	Entity=(86-abstract-new-cf7-1-sgl)
29	themselves	themselves	PRON	PRP	Number=Plur|Person=3|PronType=Prs	27	obl:npmod	27:obl:npmod	Entity=(78-animal-giv:act-cf2-1-ana)|SpaceAfter=No
30	.	.	PUNCT	.	_	8	punct	8:punct	_
