Robert is almost certainly s/o John Kinley + Margt Kelly (m Lon 18201208) bapt Lon 18240905 - John is also a lead miner at laxey mines in 1841 and as widowed margt is with Robert in 1851 John prob d 1847 age 49 which makes him likely s/o robt kinley + margt corlet - robt was still alive in 1851 widower (in 1841 also a lead miner) living with son-i-law wm clague + dau cath - bur Lon 18550112 age 85 thus prob s/o thomas Kinley + elizth lewin (m lon 17670423 - both lonan) bap Lon 17720119 - thos prob bur Lon 18020207 + eliz bur Lon 18140116 - neither seemed to leave wills thus probably quite poor - it is possible that Thos is s/o Wm Kinley + jane clague bapt Lon 17380307 - noted as of Laxey. Jane left a will 1784 - [bur Lon 17840419] d 18 apr 1784;widow;d-i-l eliz;son philip;dau jane clague exec[?Lon 17440916];phinlo h/o jane - wm will 1759 - [bur Lon 17590516];d 6 jun 1759;laxey;ch unnamed;wife jane als claigue - thus some question as to identification of Thomas - there is a will for a Robt Kinley 1776 lonan which I van't as yet seen which may help as Robt seems to be a family name
The link with Casement is I presume via Jane w/o John d 1831 age 73 (no other Kinley MI's I can see in Lonan tho there may be some in new lonan yard) who I think was d/o Philip Kinley + Eliz Skillicorn bapt Lon 17620221 (tho there is thus a query on MI)but seems confirmed by Elizth's will d 5 jan 1793;dau jane casement w/o john ;husb philip;Philip will - d 27 nov 1801;gdau jane casement execx - the only other child I have to this couple is Philip bapt Lon 17641209 but he is not in mo's will and I can't see any linkage to your putative family.

Maybe however Sally Ann Kinley who has much info on Kinley families might help