By Joseph Wilkes & Mitya Underwood Prince Harry is torn between his desire to support his sister-in-law Kate Middleton after her cancer diagnosis and supporting his wife, Meghan Markle, who dreads a return to the UK – for two reasons. That’s according to royal insiders, who have claimed that Meghan, 42, fears bringing their children to Britain over security fears – but also her own anxiety about not being welcomed. Harry, 39, was due to visit the UK for the first time in months to to attend theInvictus Games 10th Anniversary Service at St Paul’s Cathedral on May 8. But both he and his wife rep…