Art theft mystery !

Crime scene:
-room on first floor; all windows locked expert one small one
-small pieces of wood found near the window
-muddy footprints (shoe size 36) between window and wall where the painting was handing
Garden:
-frame of the painting found in pieces at the bottom of the garden
-small , sharp knife found by dustbin
-footprints (shoe size 36 and 44) lead from lawn to road via dustbin.
Visitors in past week:-
-Jake Silversmith , art expert , looked at the painting last week and offered to buy it. Jake Silversmith can`t have stolen the painting. He is art expert and it is possible to go into the room and stole the painting but the room was still locked this morning. So he is not the thief.
-Justin Goodman , cousin and poor relation. Asked Max for money.
Justin may have been the thief but he isn`t . He had asked Max for money but that don`t make Justin the thief. I haven`t evidences to prove that he is the thief.
-Frank Constance , neighbor , mid 60s , short and heavy (shoe size 41) Max owes him money. Frank could have been the thief but it`s possible not to be. He is Max`s neighbor. But he looks short and heavy and can`t have gone into the window.
-Dave Thorman , window cleaner and art enthusiast , came with daughter (14)Dave must have been the thief. He is window cleaner so he can repair windows. But the most important evidence is that he comes with his daughter (14).She may have gone thru the window and take the painting. Shoe size is also important. Children on age 14 usually buy shoes with number 36.
With these evidences I think the thief is Dave Thorman with help on his daughter.

Vaska Churkova