#And not in some creepy 'neglected child/preying paedo' way.

[stromuprisahat]

Prince Daemon had at last returned to court. Wearing a crown and styling himself King of the Narrow Sea, he appeared unannounced in the skies above King’s Landing on his dragon, circling thrice above the tourney grounds … but when at last he came to earth, he knelt before his brother and offered up his crown as a token of his love and fealty. Viserys returned the crown and kissed Daemon on both cheeks, welcoming him home, and the lords and commons sent up a thunderous cheer as the sons of Prince Baelon Targaryen were reconciled. Amongst those cheering loudest was Princess Rhaenyra, who was thrilled at the return of her favorite uncle, and begged him to stay a while. Prince Daemon did remain at King’s Landing for half a year, and even resumed his seat on the small council, but neither age nor exile had changed his nature. Daemon soon took up again with old companions from the gold cloaks and returned to the establishments along the Street of Silk where he had been such a valued patron. Though he treated Queen Alicent with all the courtesy due her station, there was no warmth between them, and men said that the prince was notably cool toward her children, especially his nephews Aegon and Aemond, whose birth had pushed him still lower in the order of succession. Princess Rhaenyra was a different matter. Daemon spent long hours in her company, enthralling her with tales of his journeys and battles. He gave her pearls and silks and books and a jade tiara said once to have belonged to the Empress of Leng, read poems to her, dined with her, hawked with her, sailed with her, entertained her by making mock of the greens at court, the “lickspittles” fawning over Queen Alicent and her children. He praised her beauty, declaring her to be the fairest maid in all the Seven Kingdoms. Uncle and niece began to fly together almost daily, racing Syrax against Caraxes to Dragonstone and back.

The Rogue Prince, or, A King’s Brother × Fire and Blood (George R. R. Martin)

... whose birth had pushed him still lower in the order of succession...

... or perhaps he just didn't like the tools his sister-in-law popped up to replace his beloved niece with? It's not like Daemon showed some kind of political amibtion ever. He's attention whore, not powerhungry conspirator.