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Mijn zoontje weet zijn vergrendelpatroon niet meer.**bleep** geraak ik terug in zijn telefoon?Wanneer ik tegelijk op de aan/uit en volume -/+ druk start hij gewoon terug op tot aan het vergrendelscherm
My son does not know his lock pattern anymore.
do I get back in his phone?
When I simultaneously press the on / off and volume - / + press, it simply starts up again until the lock screen
GT
Hi @Ibenowski
Welcome to the community!
Your post has been translated as this is a Global forum so please remember all posts/replies must be in English 
You will need to perform a software repair using Xperia Companion. This will remove the pattern lock from the device.
Let me know if you have any further issues 