Tim Crowley’s Great Grandmother Marianne McCarthy was a second cousin of Marianne O’Brien, the Mother of Michael Collins. Marianne McCarthy kept a Journal with many references to her cousins the Collins Family, some from before they became famous.
In the lead up to the revolutionary period, Tim Crowley's Great Grand Uncle, Tim Hurley successfully defended his mill against an attempted eviction during the land war in October 1886.
Tim Crowley's Grandfather Tim Crowley senior won a Railway Shield hurling medal with Clonakilty Gaelic Athletic Association in 1914.
Tim Crowley and his brother John both members of the Lyre Company of the Irish Volunteers were on active service during the 1916 Rising and were after entered at From-goch Camp in Wales, in loft No 3 with Michael Collins.
Tim and John's sisters Mary and Ellen were members of the women's section of the IRA(Cumman na mBan). They provided beds and dozens of meals in their house every week for IRA men on the run.
Mike Crowley another brother in 1925 married May Quigley who in 1920 was engaged to the famous Tipperary IRA Commander Sean Treacy.
Sean Treacy was shot dead during a gunfight with British agents on Talbot Street in Dublin in October 1920, while working with Michael Collins' Squad.