The use of to where you are expecting of is unremarkable, just less common. It has been used in literature and law for more than a thousand years. A source and some examples follow.
New English Dictionary, volume TI–TZ, Oxford University Press, 1926 printing:
To
A. prep. (in ordinary use, before a sb.)
V. Indicating addition, attachment, accompaniment, appurtenance, possession.
17. After belong and verbs of similar meaning (q.v.); also after be with the sense of belong; also after a sb., in the sense ‘appertaining or belonging to’: sometimes equivalent to ‘of’ or the possessive case of the sb.
c 893 K. ÆLFRED *Oros. ɪ. i. § 21 Þæt Witland belimpeð to Estum.
972 Charter in Birch Cart. Sax. III. 589 Ðis sind þa land ȝemæra þæs londes þe lympð to Sture.
1451 Rolls of Parlt. V. 226/2 Godes … that were sumtyme to the seid William
c 1530 LD. BERNERS Arth. Lyt. Bryt. 299, I am doughter to a king.
1605 CAMDEN Rem. (1637) 281 Katherine, wife to Charles Brandon, Duke of Suffolke.
1719 DE FOE Crusoe (1840) I. i. 2 Lieutenant-colonel to an English regiment of foot.
Ibid. 5 Clerk to an attorney.