Rumer Willis has taken to Instagram to share a particularly poignant post in light of her father's recent health diagnosis.READ: Rumer Willis alters her appearance but fans aren't sure if it's real or notJust last month, the family announced that Bruce Willis was retiring after being diagnosed with aphasia. WATCH: Emma Heming Willis shares sweet video of husband Bruce WillisAnd posting on social media on Tuesday, Rumer revealed she was working on a special gift for her dad.READ: Demi Moore shares heartfelt family photograph with all three daughtersMORE: Demi Moore mistaken for Cher in bold new photoThe 33-year-old posed for a picture showing her sat on a sofa, with a large guitar across her lap. She sweetly explained: "Out of practice but trying to play some tunes for my Daddio." Rumer has picked up her guitar again to play to her father"Sending good wishes and blessings to you and your Daddio, hoping he's doing well," one fan wrote in response, while a second noted: "I feel music will help Bruce since he has such a connection to it."READ: Rumer Willis shares video of mom Demi Moore dancing in just a towel - 'My favourite'MORE: Bruce Willis enjoys sweet date with daughters he shares with ex Demi MooreA third enthused: "You are such a beautiful soul and, my goodness, what a beautiful girl!! You are gorgeous! Playing music for your Daddy is smart too, and extremely thoughtful.