Prince George, Princess Charlotte and Prince Louis are set to join Prince William on an upcoming royal engagement. The Prince of Wales is poised to visit a homeless centre later this year. The move echos his mother Princess Diana’s own visits to homeless centres in the 1990s. Prince William is set to bring his children, George, Charlotte and Louis with him on the engagement, according to The Times. In June, the Prince of Wales launched a five-year programme in a bid to tackle homelessness across the UK. William said regarding the venture: “In a modern and progressive society, everyone should h…