Demi Moore's sister-in-law says she is too old to have children.Lesley Guynes - who is embroiled in a bitter custody battle with her estranged husband, Demi's half-brother, Morgan - insists the 44-year-old star and toy boy husband Ashton Kutcher will have to seek medical help if they want to start a family of their own.Lesley told America's Star magazine: "I think Demi is getting too old to have kids with Ashton. They have been trying to have children together for years."Lesley also claims Demi - who has three children, Rumer, 18, Scout, 16, and Tallulah, 12, with her ex-husband Bruce Willis - is desperate to "get her hands on" Lesley's six-year-old twin sons, after Demi suffered a miscarriage in 2005.Lesley said: "Demi had a miscarriage two years ago. Now she is trying to get her hands on my kids. I think there is some kind of co-dependency. Demi has been bankrolling Morgan so that she can stay involved with all his offspring and keep all of her little flock close. She's a piece of work."Demi has made no secret of her desire to have children with 29-year-old Ashton.She recently said: "I most definitely want to have children with Ashton. Most definitely.

"Once you hit three, and you're outnumbered, it's really like, 'What's the difference between three or four or five.' "

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